
Healthy trees do not happen by accident in Longmont. Between alkaline clay soils that lock up essential nutrients, semi-arid conditions that stress non-native species, and a growing list of pests and diseases, proactive health care is the difference between trees that thrive and trees that slowly decline. Our plant health care program addresses the root causes of tree stress.
Iron chlorosis, aphid infestations, scale insects, cytospora canker, and drought stress are among the most common tree health issues we treat in Longmont. Rather than treating symptoms, our arborists diagnose the underlying problem through soil testing, canopy assessment, and pest identification, then prescribe targeted treatments that restore vigor and build long-term resilience.

We inject customized nutrient blends directly into the root zone, bypassing Longmont's compacted clay layer. This delivers nitrogen, phosphorus, potassium, and micronutrients where roots can access them while aerating compacted soil.
Longmont's alkaline soils cause widespread iron chlorosis in susceptible species. We treat chlorotic trees through chelated iron applications, soil acidification, and trunk injection to restore green color and normal growth.
From aphids and scale insects to cytospora canker and fire blight, we identify and treat the pests and diseases affecting Longmont trees. Our integrated approach combines targeted treatments with cultural practices that reduce future susceptibility.

While our home base is Longmont, our tree care crews serve communities throughout Boulder County and the northern Front Range. From the established neighborhoods of Boulder and Lafayette to the growing communities of Erie and Berthoud, we bring the same licensed, insured, and ISA-certified expertise to every property we work on. The tree species, soil conditions, and climate challenges across these communities are similar to what we see daily in Longmont, which means our local knowledge translates directly to quality results wherever we work.
Frequently Asked Questions
Tree Service can be complex, and weโre here to provide answers to common questions. Here are some frequently asked questions from our clients.
Tree trimming costs in Longmont typically range from $200 to $1,800 depending on the tree species, height, number of branches requiring work, and accessibility. Cottonwoods and mature elms along the St. Vrain corridor often fall on the higher end due to their size. We provide free on-site estimates so you know exactly what to expect before any work begins.
Longmont requires all tree contractors performing work aloft to hold a City of Longmont Tree Contractor License under Municipal Code Chapter 6.88. Licensed contractors must carry $1,000,000 in general liability insurance and employ at least one ISA Certified Arborist. Always ask for proof of licensing before hiring anyone to work on your trees.
The best time to trim most trees in Longmont is during late fall through early spring while they are dormant. This reduces stress on the tree and minimizes disease transmission risk. However, dead or hazardous branches should be removed immediately regardless of season. Spring-flowering trees like crabapples are best pruned right after they bloom.
Signs your tree may need removal include large dead branches in the crown, significant trunk decay or cavities, visible fungal growth at the base, severe lean that has changed recently, root heaving, and major structural cracks. If more than 50 percent of the crown is dead or damaged, removal is usually more practical than attempting to save the tree.
Emerald ash borer was confirmed in Longmont in 2016 and now threatens every ash tree in the city. Treatment with trunk injection is most effective when started before significant canopy loss occurs. The City of Longmont Forestry Services maintains a public ash tree map and encourages private property owners to consult with a licensed tree contractor about treatment options.
After the 2021 Marshall Fire destroyed over 1,100 homes in Boulder County, wildfire mitigation became essential for properties near the foothills. Creating defensible space involves thinning trees, removing ladder fuels, and maintaining clearance zones around structures. Boulder County homeowners may qualify for 50 percent cost sharing through the Wildfire Partners program.
Yellowing leaves with green veins is a hallmark of iron chlorosis, which is extremely common in Longmont due to the high-pH alkaline clay soils. The high soil pH locks up iron and makes it unavailable to tree roots. Species like red maple, pin oak, and silver maple are most susceptible. Treatments include chelated iron applications, soil acidification, and trunk injection.
Deep root fertilization delivers nutrients directly into the root zone through pressurized injection. This bypasses Longmont's compacted clay soils and ensures trees receive the nitrogen, phosphorus, potassium, and micronutrients they need. The process also aerates compacted soil around roots. We customize nutrient blends based on soil testing and species-specific requirements.
Signs of tree stress include premature leaf drop, undersized or discolored leaves, excessive deadwood in the canopy, bark cracking or peeling, reduced annual twig growth, and increased susceptibility to insects or disease. In Longmont, drought stress and alkaline soil conditions are the most common underlying causes. Early intervention through proper care often reverses decline.
Yes. Colorado's dry winters combined with Chinook wind events can severely dehydrate trees, especially evergreens and newly planted stock. Water deeply once or twice per month during winter when temperatures are above 40 degrees and the ground is not frozen. Focus on trees planted within the last three years and any species showing signs of drought stress from the previous summer.
An annual look is reasonable for most properties, and twice a year for large trees over houses, driveways, or play areas. Longmont's wet spring snows and Chinook wind events also make a post-storm check worthwhile. Problems caught in the first season are usually manageable, while the same issue found three years later often ends in removal.
We select and place treatments with that in mind, favoring trunk injection and targeted root-zone applications over broadcast spraying when edibles are nearby. Tell us where your beds are before the visit so we can adjust the approach or timing. If a particular treatment is not appropriate next to a garden, we will say so and offer another route.
Yes. That sticky film is honeydew from aphids or scale feeding in the canopy, and it is very common on Longmont's maples, lindens, and elms. Treatment timed to the insect's life cycle stops the drip at the source. Rinsing the deck or car only addresses the symptom.
Black film is usually sooty mold growing on honeydew left by aphids or scale, which means the actual problem is the insect above it. A powdery white coating is more often powdery mildew, a fungal issue driven by crowded canopies and poor airflow. The two need different responses, which is why identifying it correctly comes first.
It is one of the highest-return things you can do for a tree in Longmont. Three to four inches of wood chip mulch out toward the drip line moderates soil temperature, holds moisture through dry stretches, keeps mowers away from the trunk, and slowly improves the clay as it breaks down. Keep it off the trunk itself; mulch piled against bark invites decay.
Sometimes, and the outcome depends on how much of the root zone was cut or compacted and how quickly the tree gets support. Symptoms often lag a year or more behind the work, so a tree that looked fine last summer can decline this one. Soil decompaction, careful watering, and mulching give it the best chance; severed structural roots on one side are a stability concern that needs assessment.
Give your Longmont trees the care they need to thrive. Contact us for a professional health assessment and treatment plan.
Our Longmont tree service team provides comprehensive tree care solutions for residential and commercial properties throughout Boulder County. From routine maintenance and emergency response to specialized treatments and land clearing, every service is performed by licensed professionals following ISA best practices. Explore our full range of tree care services below.
We pride ourselves on delivering great results and experiences for each client. Hear directly from home and business owners whoโve trusted us with their Tree Service needs.

They removed a massive dead cottonwood that was leaning toward our garage after the spring snowstorm. The crew was professional, careful with our landscaping, and cleaned everything up perfectly. Best tree service experience we have had in Longmont.
โ Longmont Homeowner

We hired them to treat our two large ash trees for emerald ash borer. They explained the treatment process clearly, answered all our questions, and followed up to check on the trees afterward. Very knowledgeable and honest about what our trees actually needed.
โ Boulder County Resident

Called for emergency service after a wind event dropped a huge branch across our driveway. They responded the same day and had everything cleared within a couple hours. Fair price, great crew, and they even gave us recommendations for preventing future issues.
โ Longmont Property Owner
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